fe_99s2 - ME 466 - Machine Design Spring Semester, 1999...

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ME 466 - Machine Design NAME ____________________________________ Spring Semester, 1999 Final Exam, 200 Points, Open Book 1. (25 Points) A shown shaft transmits 5 horsepower at a speed of 600 rpm. The bearing at A is designed to take all of the axial load. Determine the following: 2. (15 Points) An identical pair of 20 ° full depth spur gears have 45 teeth each and rotate together at a speed of 5000 rpm. They have a diametral pitch of 10 and a face width of 1.25 inch. The gears are made of alloy steel with a core hardness of 400 Bhn. The tooth profiles are finished with a fine-grinding operation that gives a degree of precision justifying the use of curve A of Fig 15.24 and the assumption that the teeth share the load. The loading involves only very mild shock, justifying the use of K o = 1.1. Estimate the horsepower that can be transmitted with 99% reliability, based on tooth bending fatigue and a factor of safety of 1.5. HP: _____________ 3. (15 Points) The gears in the previous problem have been case hardened to 60 R c (650 Bhn) giving a high surface hardness. Estimate the horse power that can be transmitted for 3000 hours with 99% reliability and a
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This note was uploaded on 07/19/2011 for the course MAE 466 taught by Professor Wallace during the Fall '09 term at University of Alabama - Huntsville.

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fe_99s2 - ME 466 - Machine Design Spring Semester, 1999...

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